UI crash when I try to use an app, display freeze, unresponsive touch screen, the only thing that I was able to do is to press the power button. This last turn the screen off, and the red LED starts blinking really fast. There is nothing to do when led is blinking that way. When the red LED blinking stop, the phone can be woken up in a normal way, but everything starts again when I try to use again an app.

Holding the power button while the phone just froze up shut it down, and once rebooted everything work fine as usual.